You can't really see it from this picture but these window markers are pretty cool. They are crayola window markers with crystallize effects. We have the perfect sliding window door that covers the whole back wall so I knew I wanted to get Lizzy some window markers. She had fun with her dad drawing all over the window and watching the colors actually crystallize. The colors aren't very bright but they actually work and crystallize which is pretty cool to watch and look at afterwards.